Turbo Deliveries claims that its record of ontime package delivery is superior to that of its nearest competitor, Sloan Transport. Selecting a random sample of 120 Turbo deliveries and 120 Sloan deliveries, you find that 84 of the Turbo deliveries were on time, while 72 of the Sloan deliveries were likewise on time. Is the difference in sample ontime rates statistically significant at the 5% significance level?
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